walk on

A new study compares walking and "less aerobic exercises, including yoga and resistance training"...

After a year, brain scans showed that among the walkers, the hippocampus had increased in volume by about 2 percent on average; in the others, it had declined by about 1.4 percent...
Both groups also improved on a test of spatial memory, but the walkers improved more.The researchers were delighted to learn that the hippocampus might expand with exercise. “And not that much exercise.” People don’t even have to join a gym. They just need shoes.

Told you so. So did Henry

 "the moment my legs begin to move, my thoughts begin to flow... An early-morning walk is a blessing for the whole day."

and Kierkegaard 

"I know of no thought so burdensome that one cannot walk away from it."

and countless others. Remember?

It's good for body and spirit alike.  It's only "boring" (as I actually overheard an otherwise-sensible colleague say recently) if you do it without imagination.

But don't do it like John Cleese.